Inkjet ispis na savitljive podloge vodljivih tinti na bazi graft kopolimera PEDOT-g-PAU

master's thesis

• Title (english): Inkjet printing of graft copolymer PEDOT-g-PAU based conducting inks on flexible substrates
• Author: Patricia Žagar
• Mentor: Zvonimir Katančić (mentor)
• Committee member: Zvonimir Katančić (predsjednik povjerenstva)
• Committee member: Zlata Hrnjak-Murgić (član povjerenstva)
• Committee member: Marijana Kraljić Roković (član povjerenstva)
• Granter: University of Zagreb; Faculty of Chemical Engineering and Technology; Zagreb
• Defense date and country: 2022-09-29, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Chemical Engineering

Abstract

Inkjet (tintni) ispis novija je tehnologija koja pokazuje potencijal za proizvodnju elektroničkih komponenata koje se ugrađuju u savitljive podloge pri čemu dolazi do razvitka novog koncepta savitljive elektronike. Vodljivi polimeri pokazuju se kao gotovo idealni materijal za tinte jer uz određene modifikacije mogu imati svojstvo intrinzičke savitljivosti uz električnu vodljivost. Fleksibilnost i rastezljivost vodljivih polimera može se poboljšati modifikacijom glavnog, vodljivog, lanca bočnim granama koje omogućuju dinamičko nekovalentno umreženje vodikovim vezama. U ovom radu kao glavni lanac korišten je vodljivi polimer poli(3,4-etilendioksitiofen) (PEDOT), a na njega su cijepljene bočne grane akrilat-uretana (AU) radikalskom polimerizacijom prijenosom atoma (ATRP) kako bi se dobio graft kopolimer PEDOT-g-PAU. Sinteza se provodila u nekoliko koraka. U prvom koraku sintetiziran je bromom funkcionalizirani tiofenski monomer (ThBr), a u drugom koraku ATRP makroinicijator PEDOT-Br. Graft kopolimer sintetiziran je ATRP polimerizacijom u različitim vremenima trajanja (0,5 h, 2 h i 4 h) gdje je duljina bočnih grana AU kontrolirana duljinom ATRP sinteze. Karakterizacija dobivenih uzoraka provedena je nuklearnom magnetskom rezonancijom (NMR), infracrvenom spektroskopijom s Fourierovom transformacijom (FTIR), termogravimetrijskom analizom (TGA), diferencijalnom pretražnom kalorimetrijom (DSC) i pretražnim elektronskim mikroskopom (SEM) dok su elektrokemijska svojstva ispitana metodom sonde s četiri točke (4PP). Dobiveni graft kopolimeri pripremljeni su u obliku tinte te inkjet tehnologijom ispisani na savitljivu podlogu od poliuretana (PU), a zatim je ispitana električna provodnost, adhezija tiskanih slojeva te njihova istezljivost. Rezultati karakterizacija potvrdili su uspješnost sinteze željenog graft kopolimera PEDOT-g-PAU koji je potom uspješno ispisan inkjet tehnologijom na savitljivu PU podlogu. Dobiveni materijali pokazuju zadovoljavajuća električna i mehanička svojstva što ukazuje na to da bi se dobiveni graft kopolimer mogao potencijalno primijeniti u nosivoj elektronici.

Abstract (english)

Inkjet printing is a newer technology that shows potential for fabricating electronic components embedded in flexible substrates, leading to the development of a new concept of flexible electronics. Conductive polymers are proving to be an almost ideal material for inks because, with certain modifications, they can exhibit the property of intrinsic flexibility along with electrical conductivity. The flexibility and stretchability of conductive polymers can be improved by modifying the conductive backbone with side branches that enable dynamic non-covalent crosslinking through hydrogen bonding. In this work, the conductive polymer poly(3,4-ethylenedioxythiophene) (PEDOT) was used as a backbone onto which acrylate-urethane (AU) side branches were grafted by atom transfer radical polymerization (ATRP) to obtain the graft copolymer PEDOT- g- PAU. The synthesis was carried out in several steps. In the first step, the bromofunctionalized thiophene monomer (ThBr) was synthesized, and in the second step, the ATRP macroinitiator PEDOT-Br. The graft copolymer was synthesized by ATRP polymerization at different durations (0.5 h, 2 h, and 4 h), and the length of the AU side branches was controlled by the length of ATRP synthesis. The obtained samples were characterized by nuclear magnetic resonance (NMR), Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), differential scanning calorimetry (DSC) and scanning electron microscopy (SEM), while the electrochemical properties were investigated by the four-point probe (4PP) method. The obtained graft copolymers were prepared in the form of ink and printed on a flexible polyurethane (PU) substrate using inkjet technology. Subsequently, the electrical conductivity, adhesion of the printed layers and their stretchability were tested. The characterization results confirmed the success of the synthesis of the desired PEDOT-g- PAU graft copolymer, which was then successfully printed on a flexible PU substrate using inkjet technology. The obtained materials exhibit satisfactory electrical and mechanical properties, indicating that the obtained graft copolymer could potentially be used in wearable electronics.

• Keywords: vodljivi polimeri; graft kopolimer; poli(3 4-etilendioksitiofen); akrilat-uretan; radikalska polimerizacija prijenosom atoma; nosiva elektronika; inkjet ispis
• Keywords (english): conducting polymer; graft copolymer; poly(3 4-ethylenedioxythiophene); acrylat urethane; atom transfer radical polymerization; wearable electronics; inkjet print
• Language: croatian
• URN:NBN: urn:nbn:hr:149:914476
• Project: Number: UIP-2019-04-8304; Title: Molekularno krojenje istezljivih i zacijeljivih vodljivih polimera za nosivu elektroniku; Title: Molecular Tailoring of Stretchable and Healable Conductive Polymers for Wearable Electronics; Acronym: SHaPes; Leader: Zvonimir Katančić; Jurisdiction: Croatia; Funder: HRZZ; Funding stream: UIP
• Study programme: Title: Chemical Engineering - Graduate study; Study programme type: university; Study level: graduate; Academic / professional title: magistar/magistra inženjer/inženjerka kemijskog inženjerstva (magistar/magistra inženjer/inženjerka kemijskog inženjerstva)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Access restricted to students and staff of home institution
• Created on: 2023-03-29 09:36:19